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Microswitches:
Three mi-
croswitches (limit switches) are
incorporated in the L915 electrical
system (Unfold/Down, Up/Fold
and Bridging microswitches)
.
Details and photos of all mi-
croswitches are provided in this
section. Adjust microswitch(s) as
detailed (
if necessary only
).
Microswitch Sequence:
Stowed Position:
When the lift
is in the stowed position, the Up/
Fold and Unfold/Down
microswitches are activated
(common and normally open
terminals have continuity).
Unfold (Out) and Lowering
Sequence:
When the lift is in the
stowed position, the Unfold/Down
microswitch is activated. This
provides current to the UNFOLD
(Out) switch circuit to energize
the Unfold, Bridging and Down
solenoid/valves to unfold the
platform. While the Unfold/Down
microswitch is activated, the
DOWN switch circuit is
interupted. When the platform
unfolds fully (reaches floor level),
the Unfold/Down microswitch is
deactivated (at rest). Deactivat-
ing this microswitch interupts the
UNFOLD (Out) switch circuit and
redirects current to the DOWN
switch circuit to re-energize the
Bridging and Down solenoid/
valves when the DOWN switch is
pressed.
Bridging Sequence:
When the
platform unfolds fully (reaches
floor level), the Bridging mi-
croswitch is activated. The
Bridging microswitch will be
deactivated if the outboard end of
the platform contacts the unload-
ing surface before the inboard
end while the DOWN switch is
pressed. The inboard end of the
platform may not contact the
unloading surface at all in such
cases as a curb or uneven
ground. The deactivated Bridging
microswitch interupts power to
the DOWN switch circuit and
stops the down travel of the
platform (while allowing the roll
stop to deploy). This prevents the
operator from lowering the
inboard end of the platform
resulting in an unsafe platform
angle.
Raise and Fold (In) Sequence:
When the platform is below floor
level, the Up/Fold microswitch is
deactivated (at rest). This directs
current to the UP switch circuit to
energize the Up/Fold solenoid to
direct current to the pump motor
when the UP switch is pressed.
The FOLD (In) switch circuit is
interupted when the platform is
below floor level. The Up/Fold
microswitch is activated when the
platform reaches floor level. This
interupts the UP switch circuit and
redirects current to the Fold (In)
switch circuit when the FOLD
switch is pressed. This re-
energizes the Up/Fold solenoid
and directs current to the pump
motor.
Electrical
(continued)
Sys
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